1965 Dart 270 4dr sedan

Connecting the wires at the bulkhead connector showed me some news. The arrow on the bulkhead connector isbpointing down. On my Dart Chargers they are pointing left. The 4 door is assembled in late 65 while the Dart Chsrger were assembled in mid December of 64.

Did they change for 1966 and started earlier? Or did the 64 fire walls continued a while during the 65 production?

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